Yes,I know, so simple... but it didn't work for me as far I didn't set the
"label" for the internal select.
I try it many times, but always without it; I didn't know it was mandatory.
Thank you.
> first_id_row = s.query(Row.id_row).\
> filter(Row.id_head == Head.id_head).\
> order_by(Row.id_row).\
> limit(1).label("first_id_row")
>
>
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